What is the point of it, having 1 less demigod to add damage and cap flags is an enormous handicap in itself, so either way the game is practically over.
Despite the AI constantly feeding, it is still easier to win with it then with 1 less demigod. I've won games where a person dropped on my team and we still won, and I've had games where someone on the enemy team dropped and they still put up a very worthy fight. Winning 2v3 is harder, since the enemy would be able to dominate flags having more people than you, and if they stuck together often, there's nothing you can do.
It also depends on what demigod the AI is, it does seem to play the melee demigods siginificantly worse, Rook is played horrendously, though of course it's awful with ranged demigods as well.
I think the best solution is to just cut the gold and xp given by Ai to 2/3 of what it is now. And also it might require programming, but seriously can't they at least make the AI just a little smarter? So many times it just walks straight into enemy territory surrounded by towers for no reason whatsoever. AI also attacks Oak when he has his Shield or Last Stand, and AI sedna and qot don't shield or heal allies at all, even when they're low on health and nearby.